SORPTIVITY OF CONCRETE . DEVELOPMENTS IN STRUCTURAL ENGINEERING. PROCEEDINGS OF THE FORTH RAIL BRIDGE CENTENARY CONFERENCE, HERIOT-WATT UNIVERSITY, ENDINBURGH, SCOTLAND, AUGUST 21-23, 1990. VOLUMES 1 AND 2

The movement of water and aggressive agents into concrete, which has been subjected to drying action, is largely dictated by the capillary suction forces at or near the exposed surface. This paper presents experimental data on the movement of water into concrete. Sorptivity results are obtained from depth of penetration tests. A high and a low strength concrete were tested to investigate the movement of a water front into concrete. Ordinary Portland cement was used throughout and specimens were cast in 300 x 150 mm cylinders. The high strength concrete had mix proportions of 1:1:2 (cement: fine aggregate: coarse aggregate by weight) and a water cement ratio of 0.35. The low strength concrete had a mix design of 1:1:3 and a water cement ratio of 0.6. On demoulding, after 24 hours, the sides of the cylinders were sealed with a latex based paint, and left to cure at 21 degrees C, 55% plus or minus 5% relative humidity. After curving the samples were placed in plastic containers on stainless steel rods and filled such that the water was 10 mm above the exposed (cut) surface. Samples were removed after 1,4,9,25 and 169 hours and split longitudinally. The depth of water penetration was detected by dusting the fractured surface with a moisture sensitive dye. The results were plotted on a depth of penetration versus root-time graph for the complete test period, and an equation obtained for calculating the depth of penetration of water. (TRRL)

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  • Corporate Authors:

    Spon (E and FN) Limited

    11 New Fetter Lane
    London EC4P 4EE,   England 
  • Authors:
    • McCarter, W J
    • EZIRIM, H
  • Publication Date: 1990

Language

  • English

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Filing Info

  • Accession Number: 00609522
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 0-419-15240-7
  • Files: ITRD, TRIS
  • Created Date: Jun 30 1991 12:00AM